FFmpeg: libavcodec/v4l2_context.h File Reference

FFmpeg

libavcodec

v4l2_context.h File Reference

#include <stdint.h>
#include <linux/videodev2.h>
#include "libavutil/pixfmt.h"
#include "libavutil/frame.h"
#include "libavutil/rational.h"
#include "codec_id.h"
#include "packet.h"
#include "v4l2_buffers.h"

Go to the source code of this file.

Data Structures

struct V4L2Context

Functions

int ff_v4l2_context_init (V4L2Context *ctx)

Initializes a V4L2Context. More...

int ff_v4l2_context_set_format (V4L2Context *ctx)

Sets the V4L2Context format in the v4l2 driver. More...

int ff_v4l2_context_get_format (V4L2Context *ctx, int probe)

Queries the driver for a valid v4l2 format and copies it to the context. More...

void ff_v4l2_context_release (V4L2Context *ctx)

Releases a V4L2Context. More...

int ff_v4l2_context_set_status (V4L2Context *ctx, uint32_t cmd)

Sets the status of a V4L2Context. More...

int ff_v4l2_context_dequeue_packet (V4L2Context *ctx, AVPacket *pkt)

Dequeues a buffer from a V4L2Context to an AVPacket. More...

int ff_v4l2_context_dequeue_frame (V4L2Context *ctx, AVFrame *f, int timeout)

Dequeues a buffer from a V4L2Context to an AVFrame. More...

int ff_v4l2_context_enqueue_packet (V4L2Context *ctx, const AVPacket *pkt)

Enqueues a buffer to a V4L2Context from an AVPacket. More...

int ff_v4l2_context_enqueue_frame (V4L2Context *ctx, const AVFrame *f)

Enqueues a buffer to a V4L2Context from an AVFrame. More...

Function Documentation

◆ ff_v4l2_context_init()

int ff_v4l2_context_init ( V4L2Context * ctx )

Initializes a V4L2Context.

Parameters: [in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.

Returns: 0 in case of success, a negative value representing the error otherwise.

Definition at line 717 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_full_reinit(), v4l2_configure_contexts(), and v4l2_try_start().

◆ ff_v4l2_context_set_format()

int ff_v4l2_context_set_format ( V4L2Context * ctx )

Sets the V4L2Context format in the v4l2 driver.

Parameters: [in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.

Returns: 0 in case of success, a negative value representing the error otherwise.

Definition at line 698 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_full_reinit(), ff_v4l2_m2m_codec_reinit(), and v4l2_configure_contexts().

◆ ff_v4l2_context_get_format()

int ff_v4l2_context_get_format ( V4L2Context * ctx,

int probe

)

Queries the driver for a valid v4l2 format and copies it to the context.

Parameters: [in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.

[in] probe Probe only and ignore changes to the format.

Returns: 0 in case of success, a negative value representing the error otherwise.

Definition at line 671 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_full_reinit(), ff_v4l2_m2m_codec_reinit(), and v4l2_probe_driver().

◆ ff_v4l2_context_release()

void ff_v4l2_context_release ( V4L2Context * ctx )

Releases a V4L2Context.

Parameters: [in] ctx A pointer to a V4L2Context. The caller is reponsible for freeing it. It must not be used after calling this function.

Definition at line 703 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_end(), ff_v4l2_m2m_codec_full_reinit(), ff_v4l2_m2m_codec_reinit(), and v4l2_m2m_destroy_context().

◆ ff_v4l2_context_set_status()

int ff_v4l2_context_set_status ( V4L2Context * ctx,

uint32_t cmd

)

Sets the status of a V4L2Context.

Parameters: [in] ctx A pointer to a V4L2Context.

[in] cmd The status to set (VIDIOC_STREAMON or VIDIOC_STREAMOFF). Warning: If VIDIOC_STREAMOFF is sent to a buffer context that still has some frames buffered, those frames will be dropped.

Returns: 0 in case of success, a negative value representing the error otherwise.

Definition at line 567 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_end(), ff_v4l2_m2m_codec_full_reinit(), ff_v4l2_m2m_codec_reinit(), v4l2_receive_packet(), v4l2_stop_decode(), v4l2_stop_encode(), and v4l2_try_start().

◆ ff_v4l2_context_dequeue_packet()

int ff_v4l2_context_dequeue_packet ( V4L2Context * ctx,

AVPacket * pkt

)

Dequeues a buffer from a V4L2Context to an AVPacket.

The pkt must be non NULL.

Parameters: [in] ctx The V4L2Context to dequeue from.

[in,out] pkt The AVPacket to dequeue to.

Returns: 0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.

Definition at line 651 of file v4l2_context.c.

Referenced by v4l2_receive_packet().

◆ ff_v4l2_context_dequeue_frame()

int ff_v4l2_context_dequeue_frame ( V4L2Context * ctx,

AVFrame * f,

int timeout

)

Dequeues a buffer from a V4L2Context to an AVFrame.

The frame must be non NULL.

Parameters: [in] ctx The V4L2Context to dequeue from.

[in,out] f The AVFrame to dequeue to.

[in] timeout The timeout for dequeue (-1 to block, 0 to return immediately, or milliseconds)

Returns: 0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.

Definition at line 631 of file v4l2_context.c.

Referenced by v4l2_receive_frame().

◆ ff_v4l2_context_enqueue_packet()

int ff_v4l2_context_enqueue_packet ( V4L2Context * ctx,

const AVPacket * pkt

)

Enqueues a buffer to a V4L2Context from an AVPacket.

The packet must be non NULL. When the size of the pkt is null, the buffer is not queued but a V4L2_DEC_CMD_STOP command is sent instead to the driver.

Parameters: [in] ctx The V4L2Context to enqueue to.

[in] pkt A pointer to an AVPacket.

Returns: 0 in case of success, a negative error otherwise.

Definition at line 606 of file v4l2_context.c.

Referenced by v4l2_receive_frame().

◆ ff_v4l2_context_enqueue_frame()

int ff_v4l2_context_enqueue_frame ( V4L2Context * ctx,

const AVFrame * f

)

Enqueues a buffer to a V4L2Context from an AVFrame.

The frame must be non NULL.

Parameters: [in] ctx The V4L2Context to enqueue to.

[in] f A pointer to an AVFrame to enqueue.

Returns: 0 in case of success, a negative error otherwise.

Definition at line 581 of file v4l2_context.c.

Referenced by v4l2_send_frame().

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